CN102435386B - For determining the system and method for indicated mean effective pressure based on crank position - Google Patents
For determining the system and method for indicated mean effective pressure based on crank position Download PDFInfo
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- CN102435386B CN102435386B CN201110297370.2A CN201110297370A CN102435386B CN 102435386 B CN102435386 B CN 102435386B CN 201110297370 A CN201110297370 A CN 201110297370A CN 102435386 B CN102435386 B CN 102435386B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
- F02D2200/1004—Estimation of the output torque
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/06—Testing internal-combustion engines by monitoring positions of pistons or cranks
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to the system and method for determining indicated mean effective pressure based on crank position, it is provided that a kind of system for vehicle includes filtration module and indicated work module.The position of this filtration module gear teeth based on the gear rotated with bent axle and produce engine speed based on the crankshaft-position signal produced by crankshaft position sensor.The rotation based on gear of this crankshaft position sensor produces this crankshaft-position signal.Based on first and second engine speed squares of this indicated work module produces the indicated work of engine cylinder combustion circulation and exports this indicated work.
Description
Cross-Reference to Related Applications
This application claims the rights and interests of the U.S. Provisional Application No.61/387,731 of JIUYUE in 2010 submission on the 29th.The disclosure of above-mentioned application is fully incorporated herein by quoting.
Technical field
The present invention relates to internal combustion engine and particularly relate to indicated mean effective pressure (IMEP).
Background technology
It is the background in order to probably introduce the present invention that background information herein describes.The work of the inventor of signature, has done a certain degree of description at background information chapters and sections at present, also has those can not be referred to as the aspect of prior art when application, and these all can not take the prior art relative to the present invention significantly or impliedly as.
Engine control system monitoring crank position.Speed of crankshaft (engine speed) and crankshaft accelerations can be determined based on crank position.The most for example, can be based on crank position, engine speed and/or Acceleration Control fuel, ignition timing, throttle opening and/or other engine parameter.
Crank position monitoring system generally includes control module (such as engine control module), crankshaft sensor and the gear rotated with bent axle.This gear can have N number of number of teeth, and this crankshaft sensor can monitor the process of these gear teeth.When the gear teeth of this gear produce the pulse in crankshaft-position signal through this crankshaft sensor, this crankshaft sensor.
This control module determines crank position based on the pulse in crankshaft-position signal.This control module can determine crank position with various bent axle rotational times interval.As an example, this control module can determine crank position by the crankshaft rotation interval more than or equal to 90 degree.The resolution (each revolution of sample number of such as bent axle) of crankshaft-position signal shortens along with this time interval and improves.
Summary of the invention
A kind of system for vehicle includes filtration module and indicated work module.The position of this filtration module gear teeth based on the gear rotated with bent axle and produce engine speed based on the crankshaft-position signal produced by crankshaft position sensor.The rotation based on gear of this crankshaft position sensor produces this crankshaft-position signal.Based on first and second engine speed squares of this indicated work module produces the indicated work of engine cylinder combustion circulation and exports this indicated work.
A kind of method includes: the position of the gear teeth based on the gear rotated with bent axle and based on the crankshaft-position signal produced by crankshaft position sensor produce engine speed, based on first and second engine speed squares produce the indicated work of engine cylinder combustion circulation and export this indicated work.The rotation based on gear of this crankshaft position sensor produces this crankshaft-position signal.
The present invention provides following technical proposal.
Technical scheme1 :A kind of system for vehicle, including:
Filtration module, the position of its gear teeth based on the gear rotated with bent axle and produce engine speed based on the crankshaft-position signal produced by crankshaft position sensor,
Wherein, the rotation based on described gear of described crankshaft position sensor produces described crankshaft-position signal；With
Indicated work module, its based on first and second engine speed squares produce the indicated work of engine cylinder combustion circulation and export described indicated work.
Technical scheme2 :System as described in technical scheme 1, wherein, described indicated work module user's formula described indicated work of setting:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described burn cycle, and described first predetermined crank position is later than described second predetermined crank position in described burn cycle.
Technical scheme3 :System as described in technical scheme 1, wherein, described indicated work module user's formula described indicated work of setting:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsBeing second engine speed of the second predetermined crank position of described burn cycle, p is predetermined gain, and q is target offset, and described first predetermined crank position is later than described second predetermined crank position in described burn cycle.
Technical scheme4 :System as described in technical scheme 1, wherein, described indicated work module user's formula described indicated work of setting:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described expansion stroke, ωyIt is the 3rd engine speed of the 3rd predetermined crank position of the compression stroke of described cylinder combustion circulation, ωxIt is the 4th engine speed of the 4th predetermined crank position of described compression stroke, described first predetermined crank position is later than described second predetermined crank position in described expansion stroke, and described 4th predetermined crank position is later than described 3rd predetermined crank position in the compression stroke.
Technical scheme5 :System as described in technical scheme 1, wherein, described indicated work module user's formula described indicated work of setting:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described expansion stroke, ωyIt is the 3rd engine speed of the 3rd predetermined crank position of the compression stroke of described cylinder combustion circulation, ωxIt is the 4th engine speed of the 4th predetermined crank position of described compression stroke, p and q is the first and second predetermined gain respectively, r is target offset, described first predetermined crank position is later than described second predetermined crank position in described expansion stroke, and described 4th predetermined crank position is later than described 3rd predetermined crank position in the compression stroke.
Technical scheme6 :System as described in technical scheme 1, wherein, described indicated work module user's formula described indicated work of setting:
In formula, W is indicated work, ωp、ωq、ωr、ωs、ωtAnd ωuIt is first of the first, second, third, fourth, the 5th and the 6th predetermined crank position, second, the 3rd, the 4th, the 5th and the 6th engine speed of the circulation of described cylinder combustion respectively, p, q, r, s, t and u are the first, second, third, fourth, the 5th and the 6th predetermined gain, and v is target offset.
Technical scheme7 :System as described in technical scheme 1, also includes indicated mean effective pressure (IMEP) module, and the discharge capacity of its described indicated work circulated based on described cylinder combustion and described electromotor determines the IMEP that described cylinder combustion circulates.
Technical scheme8 :System as described in technical scheme 7, also includes module of misfiring, its appearance misfired in detecting described cylinder based on described IMEP.
Technical scheme9 :System as described in technical scheme 7, also includes fault detection module, and it diagnoses the appearance of fault in described vehicle based on described IMEP.
Technical scheme10 :System as described in technical scheme 7, also include following at least one:
Fuel control module, its based on described IMEP optionally adjust described cylinder future burn cycle fuel supply；
Ignition control module, its based on described IMEP optionally adjust described cylinder described future burn cycle ignition timing；
Throttle control module, it optionally adjusts throttle opening based on described IMEP；With
Phaser control module, it optionally adjusts the aperture of at least one in inlet valve and exhaust valve based on described IMEP.
Technical scheme11 :A kind of method, including:
The position of the gear teeth based on the gear rotated with bent axle and produce engine speed based on the crankshaft-position signal produced by crankshaft position sensor；
Wherein, the rotation based on described gear of described crankshaft position sensor produces described crankshaft-position signal；
Based on first and second engine speed squares of indicated works producing engine cylinder combustion circulation；And
Export described indicated work.
Technical scheme12 :Method as described in technical scheme 11, also include user's formula set described indicated work:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described burn cycle, and described first predetermined crank position is later than described second predetermined crank position in described burn cycle.
Technical scheme13 :Method as described in technical scheme 11, also include user's formula set described indicated work:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsBeing second engine speed of the second predetermined crank position of described burn cycle, p is predetermined gain, and q is target offset, and described first predetermined crank position is later than described second predetermined crank position in described burn cycle.
Technical scheme14 :Method as described in technical scheme 11, also include user's formula set described indicated work:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described expansion stroke, ωyIt is the 3rd engine speed of the 3rd predetermined crank position of the compression stroke of described cylinder combustion circulation, ωxIt is the 4th engine speed of the 4th predetermined crank position of described compression stroke, described first predetermined crank position is later than described second predetermined crank position in described expansion stroke, and described 4th predetermined crank position is later than described 3rd predetermined crank position in the compression stroke.
Technical scheme15 :Method as described in technical scheme 11, also include user's formula set described indicated work:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described expansion stroke, ωyIt is the 3rd engine speed of the 3rd predetermined crank position of the compression stroke of described cylinder combustion circulation, ωxIt is the 4th engine speed of the 4th predetermined crank position of described compression stroke, p and q is the first and second predetermined gain respectively, r is target offset, described first predetermined crank position is later than described second predetermined crank position in described expansion stroke, and described 4th predetermined crank position is later than described 3rd predetermined crank position in the compression stroke.
Technical scheme16 :Method as described in technical scheme 11, also include user's formula set described indicated work:
In formula, W is indicated work, ωp、ωq、ωr、ωs、ωtAnd ωuIt is first of the first, second, third, fourth, the 5th and the 6th predetermined crank position, second, the 3rd, the 4th, the 5th and the 6th engine speed of the circulation of described cylinder combustion respectively, p, q, r, s, t and u are the first, second, third, fourth, the 5th and the 6th predetermined gain, and v is target offset.
Technical scheme17 :Method as described in technical scheme 11, also includes that the discharge capacity of described indicated work and the described electromotor circulated based on described cylinder combustion determines the indicated mean effective pressure (IMEP) that described cylinder combustion circulates.
Technical scheme18 :Method as described in technical scheme 17, the appearance misfired in also including detecting described cylinder based on described IMEP.
Technical scheme19 :Method as described in technical scheme 17, also includes diagnosing the appearance of fault in described vehicle based on described IMEP.
Technical scheme20 :Method as described in technical scheme 17, also include following at least one:
Based on described IMEP optionally adjust described cylinder future burn cycle fuel supply；
Based on described IMEP optionally adjust described cylinder described future burn cycle ignition timing；
Throttle opening is optionally adjusted based on described IMEP；With
The aperture of at least one in inlet valve and exhaust valve is optionally adjusted based on described IMEP.
Will become apparent from more suitable application areas of the present invention from the detailed description provided below.Should be appreciated that detailed description and specific examples simply play the effect of citing, and be not intended to limit the scope of the invention.
Accompanying drawing explanation
The present invention be will be more fully appreciated, wherein by the detailed description and the accompanying drawings:
Fig. 1-3 is the theory diagram of example control system in accordance with the principles of the present invention；
Fig. 4 is the theory diagram of filtration module of demonstrating in accordance with the principles of the present invention；
Fig. 5 is the theory diagram of demonstration engine combustion module in accordance with the principles of the present invention；With
Fig. 6 is flow chart, describes the demonstration methods determining indicated mean effective pressure (IMEP) that engine cylinder combustion circulates according to the principle of the invention.
Detailed description of the invention
Description below is substantially merely illustrative, and is in no way intended to limit invention, its application, or uses.For the sake of clarity, accompanying drawing is presented with like reference characters similar element by making.Word used herein " at least one in A, B and C " is construed that the logic (A or B or C) meaning to use non-exclusive logical OR.Should be appreciated that the step in method can perform with different order, as long as not changing the principle of the present invention.
Word used herein " module " also refers to, belongs to or includes special IC (ASIC)；Electronic circuit；Combinational logic circuit；Field programmable gate array (FPGA)；Perform the processor (shared, special or packet) of code；Other suitable means of described function is provided；Or above-mentioned some or all of combination, such as monolithic system.Word " module " can include the memorizer (shared, special or packet) of the code that storage performs by processor.
Term code used above can include software, firmware and/or microcode, and also refers to program, routine, function, class and/or object.Word used above " shared " mean single (sharing) processor to be used to perform from some or all codes of multiple modules.Additionally, some or all codes from multiple modules can be stored by single (sharing) memorizer.Word " packet " used above means one group of processor to be used to perform from some or all codes of individual module.Additionally, some or all codes from individual module can use storage stack to store.
Apparatus and method described herein can be realized by the one or more computer programs performed by one or more processors.Computer program includes the processor executable being stored on non-transitory tangible computer computer-readable recording medium.Computer program can also include the data of storage.The non-limitative example of non-transitory tangible computer computer-readable recording medium is nonvolatile memory, magnetic memory and optical memory.
When the gear teeth of N gear are through crankshaft position sensor, this crankshaft position sensor produces pulse.This N gear rotates with engine crankshaft.Control module such as engine control module (ECM) receives this pulse and determines speed of crankshaft based on rotary distance between the gear teeth involved by the interval between two pulses and the two pulse.The rotating speed determined based on the interval between having separated more than or equal to two pulses of 90 degree of rotary distances is properly termed as low resolution speed.The rotating speed determined based on the interval between having separated less than two pulses of 90 degree of rotary distances is properly termed as high-resolution speed.
This N gear can have the space (i.e. N=60) for such as 60 equidistant gear teeth.This N gear can include roughly equidistant 58 gear teeth and lack to fall the breach of 2 roughly equidistant gear teeth.Therefore, the ad-hoc location (such as edge) of each gear teeth (including hypodontia) can separate the rotary distance of substantially 6 degree (360 degree/60=6 degree).But, the rotary distance between the ad-hoc location of the continuous gear teeth can change.In other words, it is possible to the change of the rotary distance existed between the ad-hoc location of two continuous gear teeth.This change can be owing to such as difference between manufacturing tolerance, part and part and/or other source one or more.
This ECM optionally learns the rotary distance between every pair of continuous gear teeth of N gear.Based on interval between pulse in this study distance and crankshaft-position signal, this control module produces engine rotational speed signal.This ECM is also to the application filtering of this engine rotational speed signal.This engine rotational speed signal is corresponding to the instant engine rotating speed at specific crank position.
Two or more instant engine rotating speeds of ECM predetermined crank based on the burn cycle position of the present invention square determine the indicated work that cylinder combustion circulates.This ECM determines, based on this indicated work, the indicated mean effective pressure (IMEP) that cylinder combustion circulates.Whether this ECM can use this IMEP to occur in such as determining cylinder misfiring, adjust burn cycle in the future during supply to the fuel of cylinder, ignition timing during next burn cycle of adjusting cylinder and/or carry out that one or more other is movable.
Referring now to Fig. 1, describe the theory diagram of exemplary vehicle system 100.Electromotor 102 produces torque for vehicle.Air sucks in electromotor 102 via inlet manifold 104.The air-flow entered in electromotor 102 can be changed by air throttle 106.Throttle actuator module 108(such as electronic throttle controller) control air throttle 106 aperture.One or more fuel injectors such as 110 fuel of fuel injector and air are mixed to form flammable air/fuel mixture.Fuel actuator module 112 controls this fuel injector (or multiple).
Cylinder 114 includes the piston (not shown) being connected with bent axle 118.Although electromotor 102 is depicted as including single cylinder 114, but electromotor 102 can include more than one cylinder.One burn cycle of cylinder 114 can include four strokes: induction stroke, compression stroke, expansion stroke and exhaust stroke.One cycle of engine includes that each cylinder experiences a burn cycle.
During induction stroke, piston drops to extreme lower position, and air and fuel can be supplied to cylinder 114.This extreme lower position can be referred to as lower dead center (BDC) position.During compression stroke, 118 pistons of bent axle are driven onto topmost position, thus the air/fuel mixture in compression cylinder 114.This topmost position can be referred to as top dead centre (TDC) position.In various types of electromotors, spark plug 120 can light air/fuel mixture.Spark actuator module 122 controls spark plug 120.
During expansion stroke, the burning of air/fuel mixture to BDC position, is thus rotatably driven bent axle 118 piston refoulement.This revolving force (i.e. torque) can be the source of the compression stress of the compression stroke of the burn cycle of next cylinder in predetermined ignition order.During exhaust stroke, the waste gas that the burning of air/fuel mixture obtains discharges cylinder 114.Camshaft phaser 124 controls inlet valve and/or the aperture of exhaust valve (or multiple) of cylinder 114.More specifically, camshaft phaser 124 controls the rotation of camshaft (not shown) to control inlet valve and/or the aperture of exhaust valve (or multiple).Phaser actuator module 126 controls camshaft phaser 124.
Crankshaft position sensor 130 monitors N gear 132 and rotation based on N gear 132 produces crankshaft-position signal 134.The most for example, crankshaft position sensor 130 can include VR (VR) sensor or the crankshaft position sensor of other suitable type.N gear 132 rotates with bent axle 118.N gear 132 includes the space for N number of equidistant gear teeth.
Whenever the gear teeth (rising edge of the such as gear teeth or trailing edge) of N gear 132 through crankshaft position sensor 130 time, crankshaft position sensor 130 produces the pulse in crankshaft-position signal 134.Therefore, each pulse in crankshaft-position signal 134 can correspond to bent axle 118 equal to 360 degree divided by the angle rotation amount of N.The most for example, N gear 132 can include the space (i.e. N=60) for 60 equidistant gear teeth, and therefore each pulse in crankshaft-position signal 134 can correspond to the bent axle rotation of about 6 degree.In different embodiments, that can save in these N number of gear teeth is one or more.The most for example, in different embodiments, two in these N number of gear teeth can be saved.
Electromotor 102 transmits torque to variator 140.Variator 140 can include manual type transmissions, automatic type variator, automatic-manual type variator or the variator of other suitable type.Variator 140 can transmit torque to one or more wheel (not shown) via transmission output shaft 142 and power drive system (not shown).
Although the rotary distance between the continuous gear teeth of N gear 132 should equal (6 degree in such as previous example), but the rotary distance continuously between the gear teeth can change.This change can be owing to such as difference between manufacturing tolerance, part and part, abrasion, sensor differences and/or other source one or more.
Engine control module (ECM) 160 optionally learns the distance between every pair of continuous gear teeth of N gear 132.Based on this study distance and crankshaft-position signal 134, ECM
160 produce the second crankshaft-position signal.ECM 160 produces engine rotational speed signal based on this second crankshaft-position signal.Engine rotational speed signal at specific crank position characterizes the instant engine rotating speed at this crank position.
ECM
The indicated work square determining this burn cycle of two or more instant engine rotating speeds of the predetermined crank position of 160 burn cycle being based respectively on cylinder 114.ECM
160 indicated works based on electromotor 102 and discharge capacity determine the indicated mean effective pressure (IMEP) of the burn cycle of cylinder 114.
Whether occur may determine that the circulation of the single cylinder fuel correction (ICFC) of next burn cycle of cylinder 114, diagnosing combustion based on this IMEP, ECM 160 during whether engine misfiring, diagnosis exist one or more fault and/or determine the driveability index (DI) of fuel.One or more engine operating parameter can be additionally or alternatively controlled based on this IMEP, ECM 160.The most for example, engine operating parameter can include that the camshaft of burning in cylinder 114 is determined phase (CA50), air inlet and/or valve actuation, ignition timing and/or other suitable engine operating parameter one or more by the fuel of 50% based on crank shaft angle.ECM 160 can additionally or alternatively perform other suitable action one or more based on this IMEP.
Referring now to Fig. 2, it is shown that the theory diagram of example control system 200.Control system 200 includes ECM 160 and crankshaft position sensor 130.ECM 160 includes filtration module 202, and it produces (instantaneous) crank position, (instantaneous) engine speed and the estimated value of crankshaft accelerations based on crankshaft-position signal 134.Filtration module 202 produces crankshaft-position signal 206, engine rotational speed signal 210 and acceleration signal 214 respectively to characterize these estimated values.Filtration module 202 can use the wave filter of such as based on Kalman wave filter, wave filter based on Chebyshev, wave filter based on Butterworth type II or other suitable type to produce these estimated values.Example embodiment below in connection with Fig. 4 is discussed in detail filtration module 202.
Crankshaft-position signal 206, engine rotational speed signal 210 and/or acceleration signal 214 can be supplied to one or more module.These modules can include such as fuel control module 218, ignition control module 222, throttle control module 226, phaser control module 230, engine combustion module 234, module of misfiring 238, fault detection module 242 and/or other suitable module one or more.
Engine combustion module 234 determines the combustion information of the burn cycle of the cylinder of electromotor 102 based on crankshaft-position signal 206, engine rotational speed signal 210 and/or acceleration signal 214.This combustion information is jointly with 244 explanations.The most for example, engine combustion module 234 is based respectively on the indicated work of this burn cycle square determining cylinder 114 of two or more instant engine rotating speeds of predetermined crank position of burn cycle.Engine combustion module 234 also determines that the indicated work of other burn cycle each of cylinder 114.
Engine combustion module 234 indicated work based on this burn cycle determines the IMEP of the burn cycle of cylinder 114.Engine combustion module 234 is additionally based upon the IMEP that the discharge capacity of electromotor 102 determines the burn cycle of cylinder 114.Engine combustion module 234 also determines that indicated work and the IMEP of each combustion incident of other cylinder each of electromotor 102.Example embodiment below in connection with Fig. 5 is discussed in detail engine combustion module 234.
Module of misfiring 234 can produce, based on crankshaft-position signal 206, engine rotational speed signal 210 and/or acceleration signal 214, information of misfiring.This information of misfiring is jointly with 246 explanations.Combustion information 244 and/or information 246 of misfiring may be used for such as adjusting fuel supply and/or timing, ignition timing, the aperture of air throttle 106, inlet valve and/or exhaust valve actuation and/or other engine operating parameter one or more.The most for example, fuel control module 218, ignition control module 222, throttle control module 226 and phaser control module 230 can produce the signal 250,254,258 and 262 being supplied to fuel actuator module 112, spark actuator module 122, throttle actuator module 108 and phaser actuator module 126 respectively based on combustion information 244 and/or information 246 of misfiring.
Fuel actuator module 112 controls fuel injection and timing based on signal 250.In spark ignition type engine, spark actuator module 122 controls ignition timing based on signal 254.Throttle actuator module 108 controls the aperture of air throttle 106 based on signal 258.Phaser actuator module 126 controls camshaft phaser 124 based on signal 262.Phaser actuator module 126 can also control one or more inlet valve timing and persistent period, exhaust valve timing and persistent period, lift range variable, VVT, variable valve actuation etc..Fault detection module 242 can optionally diagnose the existence of one or more fault based on crankshaft-position signal 206, engine rotational speed signal 210, acceleration signal 214, combustion information 244 and/or information 246 of misfiring.
Referring now to Fig. 3, give the theory diagram of another control system 300.Control system 300 includes ECM 160 and memorizer 302.In different embodiments, in memorizer 302 can be implemented in ECM 160.ECM 160 includes time logging modle 306, filtration module 202, speed setting module 310 and position history module 314.Position history module 314 includes Constant Acceleration module 318, constant acceleration rate module 322 and exponential damping module 326.Memorizer 302 includes markers array 330, gear position array 334 and merges gear position array 338.
Time logging modle 306 records the markers of each pulse in crankshaft-position signal 134, such as, during crankshaft deceleration event.These markers can be recorded during gear teeth learning process.Each markers can associate gear teeth of N gear 132.Crank position, engine speed and/or acceleration information can be obtained based on these markers stored.
These markers can be stored in markers array 330.These markers arrays 330 can include the markers array 330 of each of the N number of tooth for N gear 132, and these markers can be stored in association markers array 330 by the gear teeth.In this way, specific markers array can include the markers associating the gear teeth of a turn for N gear 132 or many turns.Each in this N number of markers array includes M entrance, markers here by or can be stored.Each of this M entrance is associated with specific engines circulation (that is, 2 turns of N gear 132).
Filtration module 202 can operate based on the information from time logging modle 306, speed setting module 310, position history module 314 and/or memorizer 302.Module 218-242 of Fig. 2 can also operate based on the information from time logging modle 306, speed setting module 310, position history module 314 and/or memorizer 302.
Speed setting module 310 can be used to control the engine speed of gear teeth learning procedure.This gear teeth learning procedure can include determining that the position (the such as crank shaft angle number of degrees) of each gear teeth (trailing edges of the such as gear teeth) of N gear 132.The position of each gear teeth may be used to determine the rotary distance between the continuous gear teeth.Position history module 314 can perform this gear teeth learning procedure and determine these positions based on the markers being stored in markers array 330.Each in these positions may be stored in gear position array 334.
Gear position array 334 can include N number of gear position array 334, and wherein, N is equal to the N of N gear 132.Each of this N number of gear position array 334 includes X entrance, crank position here by or can be stored.Each of this X entrance joins with specific engines circular correlation.These positions can be determined via Constant Acceleration module 318, constant acceleration rate module 322 and/or exponential damping module 326.
X position entrance of each of N number of gear position array of gear position array 334 can be averaged to determine N number of mean place by position history module 314.The meansigma methods of X the position entrance each corresponding to determine for the association gear teeth of N gear 132 of this N number of mean place.This N number of mean place may be stored in merging in the N number of array in gear position array 338.
Referring now to Fig. 4, give the theory diagram of the example embodiment of filtration module 202.Filtration module 202 can include such as Kalman filter, Butterworth type II wave filter, Chebyshev wave filter or the wave filter of other suitable type.In the case of filtration module 202 includes Kalman filter, filtration module 202 can include for determining or estimate instantaneous crank position, instant engine rotating speed and the state estimator of (averagely) crankshaft accelerations.
Definition describes the function (such as equation) of the dynamic characteristic of electromotor 102.These functions are used for producing the estimated value of state variable (the most instantaneous crank position, instant engine rotating speed and crankshaft accelerations).These estimated values relatively produce error signal respectively compared with the measured value of these state variables, feed back these error signals to revise the estimated value in future of these state variables.Such as, the error between feedback estimated value and mensuration instant engine rotating speed revises the estimated value in future of instant engine rotating speed.
Filtration module 202 can include position filtering module 402, pie slice module 406 and acceleration filtration module 410.Position, speed and acceleration filtration module 402,406 and 410 include position, speed and acceleration counter module 414,418 and 422 respectively.Position, speed and acceleration filtration module 402,406 and 410 respectively further comprise position, speed and acceleration estimation device module 426,430 and 434.The output of estimator module 426,430 and 434 is crankshaft-position signal 206, engine rotational speed signal 210 and acceleration signal 214 respectively.Position, speed and acceleration filtration module 402,406 and 410 can operate based on the information of time logging modle 306, speed setting module 310, position history module 314 and/or memorizer 302 from Fig. 3.
Position calculator module 414 receives crankshaft-position signal 134 from crankshaft position sensor 130.Position calculator module 414 produces the second crankshaft-position signal 440 based on crankshaft-position signal 134.Position estimator module 426 output crank shaft position signalling 206.
Error module 444 produces position error signal 448 based on the difference between crankshaft-position signal 206 and the second crankshaft-position signal 440.Position error signal 448 is fed back to position estimator module 426, and position estimator module 426 can the most optionally adjust crankshaft-position signal 206 based on position error signal 448.
Velocity calculator module 418 receives crankshaft-position signal 206.Velocity calculator module 418 produces the second engine rotational speed signal 452 based on crankshaft-position signal 206.Rate estimator module 430 output engine tach signal 210.
Error module 456 produces speed error signal 460 based on the difference between engine rotational speed signal 210 and the second engine rotational speed signal 452.Speed error signal 460 is fed back to rate estimator module 430, and rate estimator module 430 can be based on speed error signal 460 at adjustment engine rotational speed signal 210 in the future.
Acceleration counter module 418 receives engine rotational speed signal 210.Acceleration counter module 418 produces the second acceleration signal 464 based on engine rotational speed signal 210.Acceleration estimation device module 434 exports acceleration signal 214.
Error module 468 produces acceleration error signal 472 based on the difference between acceleration signal 214 and the second acceleration signal 464.Acceleration error signal 472 is fed back to acceleration estimation device module 434, and acceleration estimation device module 434 can be based on acceleration error signal 472 at adjustment acceleration signal 214 in the future.Engine speed 210 can be stored in such as memorizer by crank position 206.Acceleration 214 and/or crank position 206 can also be stored.
Referring now to Fig. 5, give the theory diagram of the example embodiment of engine combustion module 234.Engine combustion module 234 can include that indicated work determines that module 502 and IMEP determines module 506.
Indicated work determines that module 502 receives engine rotational speed signal 210 from filtration module 202.Indicated work determines that module 502 is based respectively on the indicated work 510 of this burn cycle square determining cylinder 114 of two or more engine speed 210 of the predetermined crank position of burn cycle.Indicated work determines that module 502 determines the indicated work 510 of each burn cycle of cylinder 114 and may determine that the indicated work 510 of each burn cycle of other cylinder each of electromotor 102.
Only for the first example, indicated work determines that module 502 can determine the indicated work 510 of the burn cycle of cylinder 114 with user's formula (1):
In formula, W is indicated work, ωeIt it is the first engine speed 210, ω of the first predetermined crank position of the expansion stroke of the burn cycle of cylinder 114sIt it is the second engine speed 210 of the second predetermined crank position of this expansion stroke.This first predetermined crank position is later than this second predetermined crank position (i.e. further from TDC) in expansion stroke.The most for example, the first and second predetermined crank positions can respectively be about after TDC 30CAD after the 36 crank shaft angle number of degrees (CAD) and TDC, is 20CAD after 40CAD and TDC after TDC respectively, or other suitable crank position.In different embodiments, the first predetermined crank position is during compression stroke, the second predetermined crank position be during expansion stroke after the first predetermined crank position.
Only for the second example, indicated work determines that module 502 can determine the indicated work 510 of the burn cycle of cylinder 114 with user's formula (2):
In formula, W is indicated work, ωeIt it is the first engine speed 210, ω of the first predetermined crank position of the expansion stroke of the burn cycle of cylinder 114sBeing the second engine speed 210 of the second predetermined crank position of this expansion stroke, p is predetermined (such as demarcating) gain, and q is predetermined (such as demarcating) deviation.This first predetermined crank position is later than this second predetermined crank position in expansion stroke.In different embodiments, the first predetermined crank position is during compression stroke, the second predetermined crank position be during expansion stroke after the first predetermined crank position.
It is as follows that equation (2) can be write as matrix form:
For the large data sets through Z burn cycle, equation (3) can expand to:
Indicated work determines that the predetermined gain (p) that module 502 is used when determining indicated work 510 can be by collecting the engine speed 210 data (ω measuring cylinder pressure data (using the cylinder pressure sensors not shown in Fig. 1), collecting different crank positions (at least e and s) place with target offset (q)1,、ω2...), based on these measure cylinder pressure data determine indicated work (W1、W2...) and be determined for predetermined gain and target offset solving equation formula (4).The most for example, predetermined gain and target offset can be determined by using regression fit analysis solving equation formula (4).Once having determined that predetermined gain and target offset, indicated work determines that module 502 just can determine the indicated work 510 during the work of electromotor 102 in the case of not measuring cylinder pressure data and not having cylinder pressure sensors.
Only for the 3rd example, indicated work determines that module 502 can determine the indicated work 510 of the burn cycle of cylinder 114 with user's formula (5):
In formula, W is indicated work 510, ωeIt it is the first engine speed 210, ω of the first predetermined crank position of the expansion stroke of the burn cycle of cylinder 114sIt it is the second engine speed 210, ω of the second predetermined crank position of this expansion strokeyIt it is the trimotor rotating speed 210, ω of the 3rd predetermined crank position of the compression stroke of the burn cycle of cylinder 114xIt it is the 4th engine speed 210 of the 4th predetermined crank position of this compression stroke.This first predetermined crank position is later than this second predetermined crank position in expansion stroke, and the 4th predetermined crank position is later than the 3rd predetermined crank position (i.e. closer to TDC) in compression stroke.The most for example, 24CAD before 60CAD and TDC before 30CAD, TDC after 36CAD, TDC after first, second, third and fourth predetermined crank position can respectively be about TDC.
Only for the 4th example, indicated work determines that module 502 can determine the indicated work 510 of the burn cycle of cylinder 114 with user's formula (6):
In formula, W is indicated work 510, ωeIt it is the first engine speed 210, ω of the first predetermined crank position of the expansion stroke of the burn cycle of cylinder 114sIt it is the second engine speed 210, ω of the second predetermined crank position of this expansion strokeyIt it is the trimotor rotating speed 210, ω of the 3rd predetermined crank position of the compression stroke of the burn cycle of cylinder 114xBeing the 4th engine speed 210 of the 4th predetermined crank position of this compression stroke, p and q is the first and second predetermined gain respectively, and r is target offset.This first predetermined crank position is later than this second predetermined crank position in expansion stroke, and the 4th predetermined crank position is later than the 3rd predetermined crank position in compression stroke.First and second predetermined gain (p with q) and target offset (r) can be determined with the method similar with above in connection with method described by equation (2)-(4).
Only for the 5th example, indicated work determines that module 502 can determine the indicated work 510 of the burn cycle of cylinder 114 with user's formula (7):
In formula, W is indicated work 510, ωp、ωq、ωr、ωs、ωtAnd ωuIt is the first, second, third, fourth, the 5th and the 6th engine speed 210 of the first, second, third, fourth of burn cycle of cylinder 114, the 5th and the 6th predetermined crank position respectively, p, q, r, s, t and u are the first, second, third, fourth, the 5th and the 6th predetermined gain, and v is target offset.The most for example, 36CAD after 30CAD and TDC after 12CAD, TDC after 24CAD, TDC before 36CAD, TDC before 72CAD, TDC before the first, second, third, fourth, the 5th and the 6th predetermined crank position can respectively be about TDC.First, second, third, fourth, the 5th (v) can be determined with the method similar with above in connection with method described by equation (2)-(4) with the 6th predetermined gain (p, q, r, s, t and u) and target offset.In different embodiments, indicated work determines that module 502 can use other suitable function of the upper indicated work 510 of square association of two or more engine speed 210 or mapping to determine indicated work 510.
IMEP determines that the indicated work 510 of module 506 burn cycle based on cylinder 114 determines the IMEP 514 of the burn cycle of cylinder 114.IMEP determines that module 506 discharge capacity based on electromotor 102 can determine IMEP 514 in addition.The most for example, IMEP determines that module 506 can set IMEP 514 and be equal to the indicated work 510 discharge capacity divided by electromotor 102 of burn cycle.The discharge capacity of electromotor 102 can be stored in the predetermined value in memorizer.Because IMEP
514 is to determine by being specifically designed for indicated work 510 determined by the combustion incident of cylinder 114, so IMEP 514 can be referred to as absolute IMEP rather than relative to IMEP relatively determined by other cylinder of electromotor 102.As it has been described above, ECM160 can perform one or more action based on IMEP 514.
Referring now to Fig. 6, give the flow chart of the demonstration methods 600 of the IMEP 514 describing the burn cycle determining cylinder 114.Control from the beginning of at 604, here, control generation engine speed 210 during the burn cycle of cylinder 114 at different crank positions.
At 608, control to be based respectively on the indicated work 510 of this burn cycle square determining cylinder 114 of two or more engine speed 210 of the predetermined crank position of burn cycle.The most for example, control can determine indicated work 510 with other suitable function of user's formula (1), (2), (5), (6), (7) or the upper indicated work 510 of square association making engine speed 210.At 612, control the IMEP 514 that indicated work 510 based on burn cycle determines the burn cycle of cylinder 114.Control to be also based on the discharge capacity of electromotor 102 and determine the IMEP 514 of burn cycle.Control can take one or more action based on IMEP 514.
The broad teachings of the present invention can be implemented in a variety of forms.Therefore, although the present invention includes specific examples, but the true scope of the present invention will not thus be restricted, because those skilled in the art are on the basis of research accompanying drawing, description and following claims, it will be apparent that obtain other remodeling.
Claims (20)
1. for a system for vehicle, including:
Filtration module, the position of its gear teeth based on the gear rotated with bent axle and produce engine speed based on the crankshaft-position signal produced by crankshaft position sensor,
Wherein, the rotation based on described gear of described crankshaft position sensor produces described crankshaft-position signal；With
Indicated work module, its based on two engine speed squares, i.e. first and second engine speed square, produce engine cylinder combustion circulation indicated work and export described indicated work.
2. the system as claimed in claim 1, wherein, described indicated work module user's formula described indicated work of setting:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described burn cycle, and described first predetermined crank position is later than described second predetermined crank position in described burn cycle.
3. the system as claimed in claim 1, wherein, described indicated work module user's formula described indicated work of setting:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsBeing second engine speed of the second predetermined crank position of described burn cycle, p is predetermined gain, and q is target offset, and described first predetermined crank position is later than described second predetermined crank position in described burn cycle.
4. the system as claimed in claim 1, wherein, described indicated work module user's formula described indicated work of setting:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described expansion stroke, ωyIt is the 3rd engine speed of the 3rd predetermined crank position of the compression stroke of described cylinder combustion circulation, ωxIt is the 4th engine speed of the 4th predetermined crank position of described compression stroke, described first predetermined crank position is later than described second predetermined crank position in described expansion stroke, and described 4th predetermined crank position is later than described 3rd predetermined crank position in the compression stroke.
5. the system as claimed in claim 1, wherein, described indicated work module user's formula described indicated work of setting:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described expansion stroke, ωyIt is the 3rd engine speed of the 3rd predetermined crank position of the compression stroke of described cylinder combustion circulation, ωxIt is the 4th engine speed of the 4th predetermined crank position of described compression stroke, p and q is the first and second predetermined gain respectively, r is target offset, described first predetermined crank position is later than described second predetermined crank position in described expansion stroke, and described 4th predetermined crank position is later than described 3rd predetermined crank position in the compression stroke.
6. the system as claimed in claim 1, wherein, described indicated work module user's formula described indicated work of setting:
In formula, W is indicated work, ωp、ωq、ωr、ωs、ωtAnd ωuIt is first of the first, second, third, fourth, the 5th and the 6th predetermined crank position, second, the 3rd, the 4th, the 5th and the 6th engine speed of the circulation of described cylinder combustion respectively, p, q, r, s, t and u are the first, second, third, fourth, the 5th and the 6th predetermined gain, and v is target offset.
7. the system as claimed in claim 1, also includes indicated mean effective pressure IMEP module, and the discharge capacity of its described indicated work circulated based on described cylinder combustion and described electromotor determines the IMEP that described cylinder combustion circulates.
8. system as claimed in claim 7, also includes module of misfiring, its appearance misfired in detecting described cylinder based on described IMEP.
9. system as claimed in claim 7, also includes fault detection module, and it diagnoses the appearance of fault in described vehicle based on described IMEP.
10. system as claimed in claim 7, also include following at least one:
Fuel control module, its based on described IMEP optionally adjust described cylinder future burn cycle fuel supply；
Ignition control module, its based on described IMEP optionally adjust described cylinder described future burn cycle ignition timing；
Throttle control module, it optionally adjusts throttle opening based on described IMEP；With
Phaser control module, it optionally adjusts the aperture of at least one in inlet valve and exhaust valve based on described IMEP.
11. 1 kinds of methods, including:
The position of the gear teeth based on the gear rotated with bent axle and produce engine speed based on the crankshaft-position signal produced by crankshaft position sensor；
Wherein, the rotation based on described gear of described crankshaft position sensor produces described crankshaft-position signal；
Based on two engine speed squares, i.e. first and second engine speed square, produce engine cylinder combustion circulation indicated work；And
Export described indicated work.
12. methods as claimed in claim 11, also include user's formula set described indicated work:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described burn cycle, and described first predetermined crank position is later than described second predetermined crank position in described burn cycle.
13. methods as claimed in claim 11, also include user's formula set described indicated work:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsBeing second engine speed of the second predetermined crank position of described burn cycle, p is predetermined gain, and q is target offset, and described first predetermined crank position is later than described second predetermined crank position in described burn cycle.
14. methods as claimed in claim 11, also include user's formula set described indicated work:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described expansion stroke, ωyIt is the 3rd engine speed of the 3rd predetermined crank position of the compression stroke of described cylinder combustion circulation, ωxIt is the 4th engine speed of the 4th predetermined crank position of described compression stroke, described first predetermined crank position is later than described second predetermined crank position in described expansion stroke, and described 4th predetermined crank position is later than described 3rd predetermined crank position in the compression stroke.
15. methods as claimed in claim 11, also include user's formula set described indicated work:
In formula, W is indicated work, ωeIt is first engine speed of the first predetermined crank position of the expansion stroke of described cylinder combustion circulation, ωsIt is second engine speed of the second predetermined crank position of described expansion stroke, ωyIt is the 3rd engine speed of the 3rd predetermined crank position of the compression stroke of described cylinder combustion circulation, ωxIt is the 4th engine speed of the 4th predetermined crank position of described compression stroke, p and q is the first and second predetermined gain respectively, r is target offset, described first predetermined crank position is later than described second predetermined crank position in described expansion stroke, and described 4th predetermined crank position is later than described 3rd predetermined crank position in the compression stroke.
16. methods as claimed in claim 11, also include user's formula set described indicated work:
In formula, W is indicated work, ωp、ωq、ωr、ωs、ωtAnd ωuIt is first of the first, second, third, fourth, the 5th and the 6th predetermined crank position, second, the 3rd, the 4th, the 5th and the 6th engine speed of the circulation of described cylinder combustion respectively, p, q, r, s, t and u are the first, second, third, fourth, the 5th and the 6th predetermined gain, and v is target offset.
17. methods as claimed in claim 11, also include that the discharge capacity of described indicated work and the described electromotor circulated based on described cylinder combustion determines the indicated mean effective pressure IMEP that described cylinder combustion circulates.
18. methods as claimed in claim 17, the appearance misfired in also including detecting described cylinder based on described IMEP.
19. methods as claimed in claim 17, also include based on the appearance of fault in described IMEP diagnosis vehicle.
20. methods as claimed in claim 17, also include following at least one:
Based on described IMEP optionally adjust described cylinder future burn cycle fuel supply；
Based on described IMEP optionally adjust described cylinder described future burn cycle ignition timing；
Throttle opening is optionally adjusted based on described IMEP；With
The aperture of at least one in inlet valve and exhaust valve is optionally adjusted based on described IMEP.
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| US38773110P | 2010-09-29 | 2010-09-29 | |
| US61/387731 | 2010-09-29 | ||
| US12/984,818 US9845752B2 (en) | 2010-09-29 | 2011-01-05 | Systems and methods for determining crankshaft position based indicated mean effective pressure (IMEP) |
| US12/984818 | 2011-01-05 |
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| CN102435386A CN102435386A (en) | 2012-05-02 |
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| CN201110297370.2A Active CN102435386B (en) | 2010-09-29 | 2011-09-29 | For determining the system and method for indicated mean effective pressure based on crank position |
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| US20120078485A1 (en) | 2012-03-29 |
| US9845752B2 (en) | 2017-12-19 |
| DE102011114109B4 (en) | 2022-12-01 |
| CN102435386A (en) | 2012-05-02 |
| DE102011114109A1 (en) | 2012-04-19 |
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